Direct imaging of icosahedral clusters in a cubic Cd6Ca approximant crystal

被引：5

作者：

Abe, E ^{[1
]}

Tsai, AP ^{[1
]}

机构：

[1] Natl Inst Mat Sci, Aperiod Solids Res Grp, Tsukuba, Ibaraki 3050047, Japan

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 2004年 / 334卷

关键词：

D O I：

10.1016/j.jnoncrysol.2003.11.036

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The structure of a cubic Cd6Ca crystal, which is constructed by a bee packing of multiple-shell icosahedral atomic clusters and regarded as a 1/1 approximant to a binary Cd5.7Ca icosahedral quasicrystal, has been investigated using atomic-resolution annular dark-field scanning transmission electron microscopy (ADF-STEM). Direct imaging of the projected icosahedral clusters reveals no significant ADF-contrast around the cluster center, suggesting that the Cd atoms at the core of the cluster are not located at definite position such as the cubic atomic sites proposed by X-ray analysis, but distributed in a significantly disordered manner. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：190 / 193

页数：4

共 12 条

[1] Reassessing the compound CeCd6:: the structure of Ce6Cd37 [J].

Armbrüster, M ;

Lidin, S .

JOURNAL OF ALLOYS AND COMPOUNDS, 2000, 307 :141-148

[2]

BRUZZONE G, 1972, GAZZ CHIM ITAL, V102, P234

[3] Stable icosahedral quasicrystals in binary Cd-Ca and Cd-Yb systems [J].

Guo, JQ ;

Abe, E ;

Tsai, AP .

PHYSICAL REVIEW B, 2000, 62 (22) :14605-14608

[4] A practical approach for STEM image simulation based on the FFT multislice method [J].

Ishizuka, K .

ULTRAMICROSCOPY, 2002, 90 (2-3) :71-83

[5]

MASSALSKI TB, 1990, BINARY ALLOY PHASE D, V1, P889

[6]

MASSALSKI TB, 1990, BINARY ALLOY PHASE D, V2, P1044

[7] YTTERBIUM-CADMIUM SYSTEM [J].

PALENZONA, A .

JOURNAL OF THE LESS-COMMON METALS, 1971, 25 (04) :367-+

[8] HIGH-RESOLUTION Z-CONTRAST IMAGING OF CRYSTALS [J].

PENNYCOOK, SJ ;

JESSON, DE .

ULTRAMICROSCOPY, 1991, 37 (1-4) :14-38

[9] Crystal and quasicrystal structures in Cd-Yb and Cd-Ca binary alloys [J].

Takakura, H ;

Guo, JQ ;

Tsai, AP .

PHILOSOPHICAL MAGAZINE LETTERS, 2001, 81 (06) :411-418

[10] A low-temperature order-disorder transition in a cubic Cd6Yb crystalline approximant [J].

Tamura, R ;

Murao, Y ;

Takeuchi, S ;

Ichihara, M ;

Isobe, M ;

Ueda, Y .

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 2002, 41 (5A) :L524-L526

← 1 2 →